Adsorption of Pb(II) from aqueous solution by acid-modified water hyacinth cellulose

Abstract

Water hyacinth has high cellulose content so that its potential to increase the adsorption capacity of heavy metal. Besides has containing cellulose, water hyacinth also contains lignin, which can inhibit the adsorption process. Delignification of water hyacinth was conducted by NaOH so that the cellulose content in water hyacinth increases as the lignin decreases. The research aimed to study the effect of nitric acid-modified on Pb(II) adsorption capacity. The various nitric acid at 0.2, 0.6, and 1 M concentrations. The influence of pH, contact time, and initial metal ion concentration in the adsorption process was studied. The analysis of Pb(II) metal ion contents in a solution used Atomic Absorption Spectrometer (AAS). Results showed that the best of Pb2+ adsorption is water hyacinth cellulose adsorbent with nitric acid modification of 1 M (D) was 8.6403 mg/g. The lowest adsorption was observed at 99.8883% for Pb2+ ion at pH 4, while the highest adsorption was 99.9477% at pH 7. The optimum contact time for Pb2+ adsorption at 100 minutes. The amount of Pb2+ ions adsorbed enhancement with an increase in the initial metal ion concentration.